The Accu-Tac HSR-340 is a meticulously crafted product from Accu-Tac. Our scope rings are precisely CNC machined, ensuring perfect alignment due to strict adherence to height, center-line, and tube bed arch measurements.We strive for perfection, and that is why we have integrated a bubble level into the design for flawless leveling of your rifle. Additionally, our use of high strength hardware ensures long-lasting durability of our scope rings.